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62 lines
1.9 KiB
TypeScript
62 lines
1.9 KiB
TypeScript
/**
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* Creates a `setInterval` that is properly cleaned up when a component unmounted
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*
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* ```tsx
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* function Timer() {
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* const [timer, setTimer] = useState(0)
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* useInterval(() => setTimer(i => i + 1), 1000)
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*
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* return <span>{timer} seconds past</span>
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* }
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* ```
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*
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* @param fn an function run on each interval
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* @param ms The milliseconds duration of the interval
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*/
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declare function useInterval(fn: () => void, ms: number): void;
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/**
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* Creates a pausable `setInterval` that is properly cleaned up when a component unmounted
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*
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* ```tsx
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* const [paused, setPaused] = useState(false)
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* const [timer, setTimer] = useState(0)
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*
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* useInterval(() => setTimer(i => i + 1), 1000, paused)
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*
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* return (
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* <span>
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* {timer} seconds past
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*
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* <button onClick={() => setPaused(p => !p)}>{paused ? 'Play' : 'Pause' }</button>
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* </span>
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* )
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* ```
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*
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* @param fn an function run on each interval
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* @param ms The milliseconds duration of the interval
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* @param paused Whether or not the interval is currently running
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*/
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declare function useInterval(fn: () => void, ms: number, paused: boolean): void;
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/**
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* Creates a pausable `setInterval` that _fires_ immediately and is
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* properly cleaned up when a component unmounted
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*
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* ```tsx
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* const [timer, setTimer] = useState(-1)
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* useInterval(() => setTimer(i => i + 1), 1000, false, true)
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*
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* // will update to 0 on the first effect
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* return <span>{timer} seconds past</span>
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* ```
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*
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* @param fn an function run on each interval
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* @param ms The milliseconds duration of the interval
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* @param paused Whether or not the interval is currently running
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* @param runImmediately Whether to run the function immediately on mount or unpause
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* rather than waiting for the first interval to elapse
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*
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*/
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declare function useInterval(fn: () => void, ms: number, paused: boolean, runImmediately: boolean): void;
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export default useInterval;
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